<!--
 * @Author: HeAo
 * @Date: 2022-07-28 11:09:28
 * @LastEditTime: 2022-08-30 20:01:10
 * @LastEditors: HeAo
 * @Description: 
 * @FilePath: \HTML5&CSS3\第十天\7-cloud.html
 * 别乱动！
-->
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>

  <style>
    * {
      margin: 0;
      padding: 0;
    }

    .bg {
      height: 100vh;
      background-color: skyblue;
      animation: sky 10s linear infinite;
    }

    /* 设置云彩样式 */
    .bg .cloud_one {
      width: 300%;
      height: 100%;
      background: url(../第九天/images/cloud_one.png) repeat-x;
      position: fixed;
      top: 0;
      left: 0;
      animation: cloud 20s linear infinite;
    }

    .bg .cloud_two {
      width: 300%;
      height: 100%;
      background: url(../第九天/images/cloud_two.png) repeat-x;
      position: fixed;
      top: 0;
      left: 0;
      animation: cloud 40s linear infinite;
    }

    .bg .cloud_three {
      width: 300%;
      height: 100%;
      background: url(../第九天/images/cloud_three.png) repeat-x;
      position: fixed;
      top: 0;
      left: 0;
      animation: cloud 60s linear infinite;
    }

    /* 设置天空背景颜色渐变 */
    @keyframes sky {
      0% {
        background-color: skyblue;
      }

      50% {
        background-color: rgb(79, 77, 77);
      }

      100% {
        background-color: skyblue;
      }
    }

    /* 设置云彩轮播 */
    @keyframes cloud {
      from {
        left: 0;
      }

      to {
        left: -200%;
      }

    }
  </style>
</head>

<body>
  <div class="bg">
    <div class="cloud_one"></div>
    <div class="cloud_two"></div>
    <div class="cloud_three"></div>
  </div>

</body>

</html>